Wireless power transmission device

ABSTRACT

The present specification relates to a wireless power transmission device. The present specification provides a wireless power transmission device comprising: a power supply unit for supplying power to the wireless power transmission device; at least one first coil for transmitting power to a wireless power reception device; and first and second condensers configured so as to be connected respectively to different both ends of the power supply unit and the first coil.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation U.S. patent application Ser. No.15/544,024, filed Nov. 21, 2017, which is a national stage ofInternational Application No. PCT/KR2016/000466, filed Jan. 15, 2016,which claims the benefit of priority to U.S. Provisional Application No.62/104,094, filed Jan. 16, 2015, the disclosures of which areincorporated herein by reference.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to wireless charging and, moreparticularly, to a wireless power transmission apparatus.

Related Art

The wireless power transfer technology is a technology that wirelesslydelivers power between a power source and an electronic device. Forexample, the wireless power transfer technology enables a battery of awireless terminal to be charged by simply placing a wireless terminalsuch as a smart phone or a tablet on a wireless charging pad. Thus,compared to a wired charging environment using a typical wired chargingconnector, the mobility, convenience, and safety can be improved. Inaddition to wireless charging of wireless terminals, the wireless powertransfer technology is attracting attention as a substitute for theexisting wired power transfer environment in various fields such aselectric vehicles, wearable devices such as Bluetooth earphones or 3Dglasses, home appliances, furniture, underground facilities, buildings,medical devices, robots, and leisure.

The wireless power transfer method is also referred to as a contactlesspower transfer method, a no point of contact power transfer method, or awireless charging method. The wireless power transfer system includes awireless power transmission apparatus for supplying electric energy by awireless power transfer method and a wireless power reception apparatusfor receiving electric energy wirelessly supplied from the wirelesspower transmission apparatus and supplying power to a power receivingdevice such as a battery cell.

The wireless power transfer technologies are largely classified into amagnetic induction method and a magnetic resonance method. In themagnetic induction method, energy is transmitted using a current inducedat a receiving side coil due to a magnetic field generated in a coilbattery cell at a transmitting side in accordance with electromagneticcoupling between a coil at the transmitting side and a coil at thereceiving side. The magnetic induction type of wireless power transfertechnology has an advantage of high transmission efficiency, but haslimitations in that the power transfer distance is limited to severalmillimeters and the degrees of the location freedom is significantly lowdue to sensitivity to matching between coils.

The magnetic resonance method is similar to the magnetic inductionmethod in that both methods use a magnetic field. However, in themagnetic resonance method, a resonance occurs when a specific resonancefrequency is applied to the coil at the transmission side and the coilat the reception side, and thus energy is transferred by a phenomenonthat the magnetic field is focused on both ends of the transmission sideand the reception side, which differs from magnetic induction method interms of energy transfer. Due to these characteristics of magneticresonance, power can be remotely transmitted unlike magnetic induction.The magnetic resonance method may transmit energy up to a relativelylong distance of several tens of centimeters to several meters comparedto the magnetic induction method, and enables power transmission to aplurality of devices at the same time. Thus, the magnetic resonancemethod is expected to be a wireless power transfer technology toimplement real cord-free devices.

SUMMARY OF THE INVENTION

The present invention provides a wireless power transmission apparatuswhich efficiently reduces a carrier power with respect to powertransmitted to a wireless power reception apparatus in a contactlesscharging system.

In an aspect, a wireless power transmission apparatus is provided. Thewireless power transmission apparatus includes: a power supply unit forsupplying power to the wireless power transmission apparatus; at leastone primary coil for transmitting power to a wireless power receptionapparatus; and first and second condensers configured to be connected toboth ends of the power supply unit and the primary coil, respectively.

The first and second condensers may be configured to reduce a reflectedpower applied from the wireless power reception apparatus to the powersupply unit as power is transmitted from the primary coil to thewireless power reception apparatus.

The wireless power transmission apparatus may further include adetection circuit that measures a current or a voltage flowing in theprimary coil.

The detection circuit may receive power data from the wireless powerreception apparatus, and generate a control signal for controlling thepower supply unit based on the power data and the current or voltageflowing in the primary coil.

The wireless power transmission apparatus may further include third andfourth condensers disposed at both ends of the detection circuit or theprimary coil and applying a required signal to the detection circuit.

The wireless power transmission apparatus may further include first andsecond grounds connected to both ends of the inductor.

The wireless power transmission apparatus may further include: a fifthcondenser connected between the inductor and the first ground; and asixth condenser connected between the inductor and the second ground.

The fifth and sixth condensers may be configured to reduce noise due toa voltage applied to the other condensers.

In another aspect, a wireless power transmission method using a wirelesspower transmission apparatus is provided. The wireless powertransmission method includes: generating power necessary fortransmitting wireless power by a power source; transmitting wirelesspower to a wireless power reception apparatus; and attenuatingreflection power reflected from the wireless power reception apparatus.

The transmitting of the wireless power may include transmitting power byat least one primary coil.

The attenuating of the reflection power may include reducing thereflection power applied to the power source by first and secondcondensers disposed at both ends of the primary coil.

The wireless power transmission method may further include measuring acurrent or voltage flowing in a primary coil by a detection circuit.

The measuring of the current or voltage may include receiving power datafrom the wireless power reception apparatus, and generating a controlsignal for controlling the power source based on the power data and thecurrent or voltage flowing in the primary coil.

The measuring of the current or voltage may include applying a requiredsignal to the detection circuit by third and fourth condensers disposedat both ends of the detection circuit and the primary coil.

First and second grounds may be connected to both ends of the inductor,a fifth condenser may be connected between the inductor and the firstground, and a sixth condenser may be connected between the inductor andthe second ground to reduce noise due to a voltage applied to the firstand second condensers.

According to an embodiment of the present invention, a carrier powerwith respect to power transmitted to a wireless power receptionapparatus in a contactless charging system can be efficiently reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 a view illustrating components of a wireless power transfersystem according to an embodiment of the present invention.

FIG. 2 is a view illustrating a wireless power transmission apparatusaccording to an embodiment of the present invention.

FIG. 3 is a view illustrating a wireless power transmission apparatusaccording to another embodiment of the present invention.

FIG. 4 is a view illustrating a wireless power transmission apparatusaccording to still another embodiment of the present invention.

FIG. 5 is a view illustrating a wireless power transmission method of awireless power transmission apparatus according to an embodiment of thepresent invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

The term ‘wireless power’ below is used to mean any type of energyassociated with an electric field, a magnetic field, and anelectromagnetic field transmitted from a wireless power transmissionapparatus to a wireless power reception apparatus without the use ofphysical electromagnetic conductors. The wireless power may also bereferred to as a power signal or wireless energy, and may denote anoscillating magnetic flux enclosed by the primary and secondary coils.For example, power conversion in a system to wirelessly charge devicesincluding mobile phones, cordless phones, iPods, MP3 players, headsetsand the like will be described herein. In this disclosure, the basicprinciples of wireless power transmission include, for example, bothmagnetic induction coupling and magnetic resonance coupling that usesfrequencies of less than 30 MHz. However, various frequencies at whichlicense-exempt operations at relatively high radiation levels, forexample, less than 135 kHz (LF) or at 13.56 MHz (HF) are allowed may beused.

FIG. 1 a view illustrating components of a wireless power transfersystem according to an embodiment of the present invention.

Referring to FIG. 1, a wireless power transfer system 100 may include awireless power transmission apparatus 110 and one wireless powerreception apparatus 150-1 or n wireless power reception apparatuses150-1 to 150-n.

The wireless power transmission apparatus 110 includes a primary core.The primary core may include one or more primary coils 115. The primarycore may further include at least one capacitor coupled to the primarycoil 115. The wireless power transmission apparatus 110 may have anysuitable form, but one preferred form is a flat platform with a powertransfer surface. Here, each of the wireless power reception apparatuses150-1 to 150-n may be located on the platform or therearound.

The wireless power reception apparatuses 150-1 to 150-n are detachablefrom the wireless power transmission apparatus 110, and each of thewireless power reception apparatuses 150-1 to 150-n includes a secondarycore coupled with an electromagnetic field generated by the primary coreof the wireless power transmission apparatus 110 when being close to thewireless power transmission apparatus 110. The secondary core mayinclude one or more secondary coils 155. The secondary core may furtherinclude at least one capacitor coupled to the secondary coil 155.

The wireless power transmission apparatus 110 transmits power to thewireless power reception apparatuses 150-1 to 150-n without directelectrical contact. In this case, the primary core and the secondarycore are referred to as being magnetic-induction-coupled ormagnetic-resonance-coupled to each other. The primary coil 115 or thesecondary coil 125 may have any suitable shape, but may be a copper wirewound around a formation having a high permeability, such ferrite oramorphous metal.

The wireless power reception apparatuses 150-1 to 150-n are connected toan external load (not shown, here, also referred to as an actual load ofthe wireless power reception apparatus), and supply power wirelesslyreceived from the wireless power transmission apparatus 110 to theexternal load. For example, the wireless power reception apparatuses150-1 to 150-n may each carry received power to an object that consumesor stores power, such as a portable electric or electronic device, or arechargeable battery cell or battery.

FIG. 2 is a view illustrating a wireless power transmission apparatusaccording to an embodiment of the present invention.

Referring to FIG. 2, a wireless power transmission apparatus 200includes a primary core 210, a driving circuit 220, a control circuit230, and a measurement circuit 240.

The primary core 210 includes at least one primary coil. For example,the primary core 210 may include at least one primary resonant coil andat least one primary inductive coil. Thus, the resonant coil and theinductive coil may be included in a single core or a single wirelesspower transmission apparatus as a single module, which can be called ahybrid type. In the hybrid type, the primary resonant coil is a coilused to transmit wireless power to the wireless power receptionapparatus by magnetic resonance coupling, and the primary inductive coilis a coil used to transmit wireless power to the wireless powerreception apparatus by magnetic induction coupling. In this case, theprimary core 210 may further include a capacitor coupled to the primaryresonant coil so as to form a magnetic resonance with the primaryresonant coil. The magnetic induction method may be used to supply ortransmit the corresponding power when the primary core 210 transmitswireless power by the magnetic resonance method. Accordingly, theprimary inductive coil may also be referred to as a drive coil.

The primary core 210 includes a plurality of primary coils, at least onecapacitor coupled to the plurality of primary coils, and at least oneswitch (not shown) that performs switching of the plurality of primarycoils. The primary core 210 generates an electromagnetic field accordingto a driving signal applied from the driving circuit 220, and transmitswireless power to the wireless power reception apparatus through theelectromagnetic field.

The driving circuit 220 is connected to the primary core 210, andapplies driving signals to the primary core 210.

The control circuit 230 is connected to the driving circuit 220, andgenerates a control signal 231 that controls an AC signal required whenthe primary core 210 generates an induction magnetic field or incurs amagnetic resonance. The control circuit 230, as a sort of processor, mayinclude Application-Specific Integrated Circuits (ASICs), other chipsets, logic circuits and/or data processing devices.

Also, the control circuit 230 may be connected to the primary core 210to provide a control signal for controlling a switch of the primary core210. Particularly, when the primary coil included in the primary core210 is a hybrid type, the control circuit 230 may perform an operationfor driving a hybrid type of coil.

The measurement circuit 240 measures a current or a voltage flowing inthe primary coil. In particular, the current measured by the measurementcircuit 240 may be an alternating current. The measurement circuit 240may be a current sensor or a voltage sensor. Alternatively, themeasurement circuit 240 may lower a high current flowing in the primarycoil to a low current for use, or may be a transformer that lowers ahigh voltage applied to the primary coil to a low voltage.

Although not shown in the drawings, the wireless power transmissionapparatus 200 may further include at least one of a storage device and acommunication module wirelessly exchanging data with the wireless powerreception apparatus. The communication module may include a RadioFrequency (RF) antenna for transmitting or receiving a signal and acircuit for processing a wireless signal. The storage device may includedisk drives, Read-Only Memories (ROMs), Random Access Memories (RAMs),flash memories, memory cards, and storage media.

FIG. 3 is a view illustrating a wireless power transmission apparatus300 according to another embodiment of the present invention. Thewireless power transmission apparatus 300 may constitute a part of thewireless power transmission apparatus 200 shown in FIG. 2. Referring toFIG. 3, the wireless power transmission apparatus 300 may include apower supply unit 310, an inductor 321, first to fourth condensers 322,323, 324, and 325, and a detection circuit 330.

The power supply unit 310 supplies power necessary for driving thewireless power transmission apparatus 300. The supplied power may be anAlternating Current (AC) or an AC voltage.

The inductor 321 may correspond to the primary coil constituting theprimary core 210 shown in FIG. 2, or may constitute a part of theprimary core 210. Meanwhile, the first to fourth condensers 322, 323,324, and 325 may be defined as first to fourth capacitors.

Referring to FIG. 3, the first condenser 322 and the second condenser323 are configured in opposite directions to each other between theinductor 321 and the power supply unit 310. In other words, the firstand second condensers 322 and 323 may be configured at both ends of theinductor 321 or at both ends of the power supply unit 310. The firstcondenser 322 and the second condenser 323 may have the samecapacitance, or may have different capacitances.

The inductor 321, the first condenser 322, and the second condenser 323may constitute a resonance antenna. In this case, the resonancefrequency of the resonance antenna is determined by the inductance ofthe inductor 321 and the capacitance(s) of the first condenser 322 andthe second condenser 323.

Meanwhile, the third condenser 324 and the fourth condenser 325 may alsobe used to constitute a resonance antenna. In this case, the resonancefrequency of the resonance antenna is determined by the inductance ofthe inductor 321 and the capacitances of the first to fourth condensers322, 323, 324, and 325.

The power transmission of the wireless power transmission apparatus 300may be achieved through a resonance phenomenon of a magnetic field. Theresonance phenomenon refers to a phenomenon in which when a near-fieldcorresponding to the resonance frequency is generated in one resonanceantenna and another resonance antenna is located therearound, bothresonance antennas are coupled to each other and thus high efficientenergy transfer occurs between the resonance antennas. When a magneticfield corresponding to the resonance frequency occurs between theresonance antennas, the resonance antennas resonate with each other, andthus energy may be generally transmitted with higher efficiency than inthe case where a magnetic field generated in the primary coil isradiated to the free space.

The induced power generated by the inductor 321 is amplified at theresonance frequency, and thus a surplus voltage having a voltagedifference with respect to the voltage of the power supply unit 310 isreflected and returned due to the generation of the induced power.Particularly, when a distance between the primary coil of the wirelesspower transmission apparatus and the secondary coil of the wirelesspower reception apparatus is larger, the reflected and returned voltagemay be larger. However, the first condenser 322 and the second condenser323 configured to be disposed at both sides of the inductor 321 as shownin FIG. 3 may reduce a reflected voltage fed back to the power supplyunit 310 through the inductor 321. The level of the reflected voltagethat is reduced may be adjusted through the adjustment of thecapacitances of the first condenser 322 and the second condenser 323,and the reflected voltage may be minimized by optimizing the adjustmentof the capacitances.

The detection circuit 330 measures a current or voltage flowing throughthe inductor 321. The current measured by the detection circuit 330 maybe an alternating current. The detection circuit 330 may be a currentsensor or a voltage sensor. The detection circuit 330 may correspond tothe measurement circuit 240 shown in FIG. 2, or may constitute a part ofthe measurement circuit 240.

Meanwhile, the detection circuit 330 may receive power datacorresponding to a power value from the wireless power receptionapparatus, may measure a current or voltage flowing through the inductor321, and may generate a control signal for controlling the power supplyunit 310 based on the power data and the current or voltage.

On the other hand, the third condenser 324 and the fourth condenser 325are configured between the inductor 321 and the detection circuit 330.In other words, the third and fourth condensers 324 and 325 may bedisposed at both ends of the inductor 321 or at both ends of thedetection circuit 330, respectively. Thus, the third and fourthcondensers 324 and 325 are configured to apply required signals to thedetection circuit 330. The third condenser 324 and the fourth condenser325 may have the same capacitance value or different capacitance values.Also, the performance of the detection circuit 330 can be improved byoptimizing the capacitances of the third condenser 324 and the fourthcondenser 325.

Meanwhile, the wireless power transmission apparatus 300 may furtherinclude an impedance matcher (not shown). The impedance matcher mayperform impedance matching. The impedance matcher may include aswitching element for switching all or a portion of the inductor 321,and the first to fourth condensers 322, 323, 324 and 325. The impedancematching may be performed by detecting a reflection signal of wirelesspower transmitted through the wireless power transmission apparatus 300,switching the switching elements based on the detected reflection signaland thus adjusting the connection state of the first to fourthcondensers 322, 323, 324 and 325 or the inductors 321. Alternatively,the impedance matching may be performed by adjusting the capacitances ofthe first to fourth condensers 322, 323, 324 and 325 or adjusting theinductance of the inductor 321.

FIG. 4 is a view illustrating a wireless power transmission apparatus400 according to still another embodiment of the present invention. Thewireless power transmission apparatus 400 may constitute a part of thewireless power transmission apparatus 200 shown in FIG. 2. Referring toFIG. 4, the wireless power transmission apparatus 400 may include apower supply unit 410, an inductor 421, first to sixth condensers 422,423, 424, 425, 426 and 427 and a detection circuit 430.

The power supply unit 410 supplies power necessary for driving thewireless power transmission apparatus 400. The supplied power may be anAlternating Current (AC) or an AC voltage.

The inductor 421 may correspond to the primary coil of the primary core210 shown in FIG. 2, or may constitute a part of the primary core 210.

The inductor 421 may correspond to the primary coil of the primary core210 shown in FIG. 2, or may constitute a part of the primary core 210.Meanwhile, the first to sixth condensers 422, 423, 424, 425, 426 and 427may be defined as first to sixth capacitors.

Referring to FIG. 4, the first condenser 422 and the second condenser423 are configured in opposite directions to each other between theinductor 421 and the power supply unit 410. In other words, the firstand second condensers 422 and 423 may be configured at both ends of theinductor 421 or at both ends of the power supply unit 410. The firstcondenser 422 and the second condenser 423 may have the samecapacitance, or may have different capacitances.

The inductor 421, the first condenser 422, and the second condenser 423may constitute a resonance antenna. In this case, the resonancefrequency of the resonance antenna is determined by the inductance ofthe inductor 421 and the capacitance(s) of the first condenser 422 andthe second condenser 423.

Meanwhile, the third condenser 424 and the fourth condenser 425 may alsobe used to constitute the resonance antenna. In this case, the resonancefrequency of the resonance antenna is determined by the inductance ofthe inductor 421 and the capacitances of the first to fourth condensers422, 423, 424 and 425.

In addition, the fifth condenser 426 and the sixth condenser 427 mayalso be used to constitute the resonance antenna. In this case, theresonance frequency of the resonance antenna is determined by theinductance of the inductor 421 and the capacitances of the first tosixth condensers 422, 423, 424, 425, 426 and 427.

The power transmission of the wireless power transmission apparatus 400may be achieved through a resonance phenomenon of a magnetic field. Theresonance phenomenon refers to a phenomenon in which when a near-fieldcorresponding to the resonance frequency is generated in one resonanceantenna and another resonance antenna is located therearound, bothresonance antennas are coupled to each other and thus high efficientenergy transfer occurs between the resonance antennas. When a magneticfield corresponding to the resonance frequency occurs between theresonance antennas, the resonance antennas resonate with each other, andthus energy may be generally transmitted with higher efficiency than inthe case where a magnetic field generated in the primary coil isradiated to the free space.

As described above, the induced power generated by the inductor 421 isamplified at the resonance frequency, and thus a surplus voltage havinga voltage difference with respect to the voltage of the power supplyunit 410 is reflected and returned due to the generation of the inducedpower. Particularly, when a distance between the primary coil of thewireless power transmission apparatus and the secondary coil of thewireless power reception apparatus is larger, the reflected and returnedvoltage may be larger. However, the first condenser 422 and the secondcondenser 423 disposed at both sides of the inductor 421 as shown inFIG. 4 may reduce a reflected voltage fed back to the power supply unit410 through the inductor 421. The level of the reflected voltage that isreduced may be adjusted through the adjustment of the capacitances ofthe first condenser 422 and the second condenser 423, and the reflectedvoltage may be minimized by optimizing the adjustment of thecapacitances.

The detection circuit 430 measures a current or voltage flowing throughthe inductor 421. The current measured by the detection circuit 430 maybe an alternating current. The detection circuit 430 may be a currentsensor or a voltage sensor. The detection circuit 430 may correspond tothe measurement circuit 240 shown in FIG. 2, or may constitute a part ofthe measurement circuit 240.

Meanwhile, the detection circuit 430 may receive power datacorresponding to a power value from the wireless power receptionapparatus, may measure a current or voltage flowing through the inductor421, and may generate a control signal for controlling the power supplyunit 410 based on the power data and the current or voltage.

On the other hand, the third condenser 424 and the fourth condenser 425are configured between the inductor 421 and the detection circuit 430.In other words, the third and fourth condensers 424 and 425 may bedisposed at both ends of the inductor 421 or at both ends of thedetection circuit 430, respectively. Thus, the third and fourthcondensers 424 and 425 are configured to apply required signals to thedetection circuit 430. The third condenser 424 and the fourth condenser425 may have the same capacitance value or different capacitance values.Also, the performance of the detection circuit 430 can be improved byoptimizing the capacitances of the third condenser 424 and the fourthcondenser 425.

The wireless power transmission apparatus 400 may further include afirst ground 441 and a second ground 442 for grounding currents fromdifferent ends of the inductor 421. Also, the fifth capacitor 426 andthe sixth capacitor 427 may be additionally disposed between theinductor 421 and the first ground 441/the second ground 442,respectively, to reduce noises due to the voltage applied to the othercapacitors.

Meanwhile, the wireless power transmission apparatus 400 may furtherinclude an impedance matcher (not shown). The impedance matcher mayperform impedance matching. The impedance matcher may include aswitching element for switching all or a portion of the inductor 421,and the first to sixth condensers 422, 423, 424, 425, 426 and 427. Theimpedance matching may be performed by detecting a reflection wave ofwireless power transmitted through the wireless power transmissionapparatus 300, switching the switching elements based on the detectedreflection wave and thus adjusting the connection state of the first tosixth condensers 422, 423, 424, 425, 426 and 427 or the inductors 421.Alternatively, the impedance matching may be performed by adjusting thecapacitances of the first to sixth condensers 422, 423, 424, 425, 426and 427 or adjusting the inductance of the inductor 421.

FIG. 5 is a view illustrating a wireless power transmission method of awireless power transmission apparatus according to an embodiment of thepresent invention.

For an understanding of the invention, a wireless power transmissionmethod according to an embodiment of the present invention shown in FIG.5 will be described with reference to FIG. 3. Referring to FIG. 3, thewireless power transmission apparatus 300 generates a power sourcenecessary for transmitting wireless power (S510). The power source maybe an alternating current (AC), and may be generated from the powersupply unit 310.

Next, the wireless power transmission apparatus 300 transmits wirelesspower to the wireless power reception apparatus (S520). The powertransmission of the wireless power transmission apparatus 300 may beachieved through a resonance phenomenon of a magnetic field. Theresonance phenomenon refers to a phenomenon in which when a near-fieldcorresponding to the resonance frequency is generated in one resonanceantenna and another resonance antenna is located therearound, bothresonance antennas are coupled to each other and thus high efficientenergy transfer occurs between the resonance antennas. When a magneticfield corresponding to the resonance frequency occurs between theresonance antennas, the resonance antennas resonate with each other, andthus energy may be generally transmitted with higher efficiency than inthe case where a magnetic field generated in the primary coil isradiated to the free space.

Next, the wireless power transmission apparatus 300 attenuates thereflection power reflected from the wireless power reception apparatus(S530). In operation S520, The power transmitted from the wireless powertransmission apparatus 300 to the wireless power reception apparatus isan induced power that is amplified at the resonance frequency, and thusa surplus voltage having a voltage difference with respect to thevoltage of the power supply unit 310 is reflected and returned due tothe generation of the induced power. Particularly, when a distancebetween the primary coil of the wireless power transmission apparatusand the secondary coil of the wireless power reception apparatus islarger, the reflected and returned voltage may be larger. However, thefirst condenser 322 and the second condenser 323 may be configured to bedisposed at both sides of the inductor 321 as shown in FIG. 3, therebyreducing a reflected voltage fed back to the power supply unit 310through the inductor 321. The level of the reflected voltage that isreduced may be adjusted through the adjustment of the capacitances ofthe first condenser 322 and the second condenser 323, and the reflectedvoltage may be minimized by optimizing the adjustment of thecapacitances. Although not shown in the drawing, the wireless powertransmission method may further include measuring a current or a voltageflowing in the primary coil by the detection circuit 330. The detectioncircuit 330 may receive power data from the wireless power receptionapparatus, and may generate a control signal for controlling the powersource based on the power data and the current or voltage flowing in theprimary coil.

The third condenser 324 and the fourth condenser 325 may be disposedbetween the inductor 321 and the detection circuit 330 to apply arequired signal to the detection circuit 330.

The invention has been described in detail with reference to exemplaryembodiments thereof. However, it will be appreciated by those skilled inthe art that changes may be made in these embodiments without departingfrom the principles and spirit of the invention, the scope of which isdefined in the appended claims and their equivalents. Therefore, thepresent invention covers all embodiments falling within the scope of thefollowing claims, rather than being limited to the above-describedembodiments.

1-15. (canceled)
 16. A wireless power transmission apparatus comprising:at least one primary coil configured to wirelessly transmit power from apower source to a wireless power reception apparatus; and a detectioncircuit configured to measure a current or a voltage associated with thepower flowing through the primary coil, wherein the detection circuitreceives power data from the wireless power reception apparatus, andgenerates a control signal for controlling the power source based on thepower data and the current or voltage flowing in the primary coil. 17.The wireless power transmission apparatus of claim 16, furthercomprising: first and second capacitors connected to each end of theprimary coil, respectively, wherein the first and second capacitors areconfigured to reduce a reflected power applied from the wireless powerreception apparatus to the power source as power is transmitted from theprimary coil to the wireless power reception apparatus.
 18. The wirelesspower transmission apparatus of claim 16, wherein the primary coil andthe first and second capacitors form a resonance antenna, and wherein aresonance frequency of the resonance antenna is based on an inductanceof the primary coil and capacitances of the first and second capacitors.19. The wireless power transmission apparatus of claim 17, furthercomprising: third and fourth capacitors disposed at both ends of thedetection circuit or the primary coil, the third and fourth capacitorsconfigured to supply measurement signals from the primary coil to thedetection circuit.
 20. The wireless power transmission apparatus ofclaim 19, wherein the primary coil, the first and second capacitors, andthe third and fourth capacitors form a resonance antenna, and wherein aresonance frequency of the resonance antenna is based, at least in parton capacitances of the third and fourth capacitors.
 21. The wirelesspower transmission apparatus of claim 19, further comprising: animpedance matcher configured to detect a reflected signal of the powertransmitted by the primary coil and control a connection state of thefirst, second, third, or fourth capacitors based on the reflectedsignal.
 22. The wireless power transmission apparatus of claim 19,further comprising first and second grounds connected to both ends ofthe primary coil.
 23. The wireless power transmission apparatus of claim22, further comprising: a fifth capacitor connected between the primarycoil and the first ground; and a sixth capacitor connected between theprimary coil and the second ground.
 24. The wireless power transmissionapparatus of claim 23, wherein the fifth and sixth capacitors areconfigured to reduce noise due to a voltage applied to the first andsecond capacitors.
 25. A wireless power transmission method using awireless power transmission apparatus, the method comprising: wirelesslytransmitting, via at least one primary coil of the wireless powertransmission apparatus, power from a power source to a wireless powerreception apparatus; and measuring a current or a voltage associatedwith the power flowing through the primary coil; receiving power datafrom the wireless power reception apparatus; and generating a controlsignal for controlling the power source based on the power data and thecurrent or voltage flowing in the primary coil.
 26. The wireless powertransmission method of claim 25, further comprising attenuatingreflection power reflected from the wireless power reception apparatus.27. The wireless power transmission method of claim 26, wherein theattenuating of the reflection power comprises reducing the reflectionpower applied to the power source by first and second capacitorsdisposed at each end of the primary coil.
 28. The wireless powertransmission method of claim 27, wherein the primary coil and the firstand second capacitors form a resonance antenna, and wherein a resonancefrequency of the resonance antenna is based on an inductance of theprimary coil and capacitances of the first and second capacitors. 29.The wireless power transmission method of claim 27, wherein themeasuring of the current or voltage includes obtaining a signal from theprimary coil via third and fourth capacitors disposed between theprimary coil and both ends of a detection circuit configured to measurethe current or voltage associated with the power flowing through theprimary coil based on the signal.
 30. The wireless power transmissionmethod of claim 29, wherein the primary coil, the first and secondcapacitors, and the third and fourth capacitors form a resonanceantenna, and wherein a resonance frequency of the resonance antenna isbased, at least in part on capacitances of the third and fourthcapacitors.
 31. The wireless power transmission method of claim 29,wherein first and second grounds are connected to both ends of theprimary coil, a fifth capacitor is connected between the primary coiland a first ground, and a sixth capacitor is connected between theprimary coil and a second ground.